Power pump jack



J. A'. MITCHELL POWER PUMP JACK 2 Sheets-Sheet 1 Filed April 4, 1947 INVEN TOR. JAMES A. MITCHELL,

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March 28, 1950 J. A. MITCHELL POWER PUMP JACK 2 Sheets-Sheet 2 I Filed April 4, 1947 Y ///////W/// a N 2 w w 9 a INVENTOR. JAMEJ' 4. 44/ 70/541,

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Patented Mar. 28, 1950 T- UNITED STATES PATENT OFFICE POWER PUMP JACK James A. Miami Little Rock, Ark. Application April 4, 1947,--Serial No. 739,424

My invention relates to a power pump jack which may be used with any type of suction pump.

It is a principal object of my invention to provide a pump jack in which are combined a short crank and a long stroke, in which the increased stroke length is accomplished without the increase of power.

It is a further object of the invention to provide a jack of the character described which is compact and which may be used with several types of pumps without any substantial mechanical change.

It is another object of the invention to provide in a jack of the character described means of operation by hand or by emergency power.

It is a still further object of my invention to provide a jack of the character described which is very efiicient in use, simple to manufacture, and one which will not easily get out of order.

Other objects and advantages of my invention will become apparent during the course of the following specification, and accompanying drawings, forming part of the specification, wherein like numerals are used to designate like parts throughout.

In the drawings:

Figure l is an elevation of a suction pump to which the jack of my invention is operably connected, the jack gear housing being shown in section,

Figure 2 is a section through the gear housing taken substantially on the line 2--2 of Figure 1,

Figure 3 is a transverse section through the gear housing, taken substantially on the line 3-3 of Figure 2, and,

Figure 4 is another transverse section through the gear housing, taken substantially on the line 4-4 of Figure 2.

Referring now in detail to the drawing, the numeral 6 refers to a hollow housing member, rectilinear in cross section and open at each end adapted to be pivotally mounted intermediate its ends for oscillatory movement in a frame 1 formed as an inverted U and supported in a ground engaging base 8 by a transverse pivot shaft 9 journaled in bearings l formed on the side of the said frame 1.

A fixed rack ll, preferably of a 16 pitch is mounted along one vertical interior face of the said housing member 6 throughout the length thereof, and opposed inwardly extending longitudinal flanges l2-l2, and |3--I3 are formed in the inner side walls closely adjacent the other 1 Claim. (01.:74-41) end thereof, the said flanges defining longitudinal recesses l4 and [5, respectively, for a purpose which will hereinafter become apparent.

The numeral l6 denotes a pulley mounted for rotation on a transverse shaft ll passing transversely through the sides of the frame "I and journaled in bearing blocks l8 carried on the respective sides thereof upwardly of the top of the housing 6. The said pulley I6 is arranged for operative connection to a source of power (not shown) by a suitable pulley belt [9, and removable handle means 2!] for manual operation or application of emergency power means is also provided. Suitable oiling means 2| is also provided on bearing blocks IS.

A short crank 22 is carried on the shaft I! for rotation therewith, and is suitably connected to a connecting rod or pitman 23 formed with a bifurcated end portion 2 between the forked arms of which is rotatably mounted the drive spur gear 25 adapted to intermesh with the fixed rack II for movement upward and downward therealong in response to the driving action of the crank 22.

The numeral 26 denotes a moveable rack adapted to be mounted in the longitudinal recess 15 for up and down translative movement therein responsive to the action of the drive gear 25 intermeshed therewith. The rack 25 is arranged at its bottom end with a pair of upstanding ears 2'! between which a gear 28, proportionately greater in diameter than the gear 25 is mounted, the said gear 28 meshing with the lower portion of the fixed rack I l and a rack 29 carried on a longitudinal member 30 mounted for reciprocation in horizontal recess M of the housing 5.

An upwardly extending arm 3| is carried on the upper end of member 30 and is pivotally connected, as at 32, to a collar 33, or other suitable connection, adapted to engage the handle or lever arm 34 of a suction pump 35, the said arm 34 being itself pivotally mounted, as at 36, on a radial bracket 31 mounted on said pump, and operatively connected, as at 38, to the connecting rod 39 of the plunger within the said pump 35.

The operation of my jack is very simple. The crank 22 when driven by the action of the pulley I6 will cause the gear 25 to roll down the rack H. In my own operating model, the gear is driven a distance of 4 inches. This same movement carries along the rack 26 and its attached gear 28 a distance exactly double that moved by gear 25. Rack 29, working on top of gear 28 moves forward exactly twice the distance moved by the gear 28, or four times the distance moved by the gear 25, thus increasing the pumping stroke of four inches to a total of 16 inches.

I have described my invention in the form best known to me at this time. It is to be understood, however, that various changes in the shape, size and arrangement of the parts may be made within the scope of the subjoined claim without departing from the spirit of the invention.

Having thus described my invention, I claim:

A pump jack for use with a pump having a laterally extending handle operatively connected with the plunger thereof, comprising a supportv including spaced upstanding sides, an elongated rectangular tubular housing pivotally mounted between said upstanding sides and having its opposite ends open, a rotatable crank mounted" between the sides and arranged above the top end of the housing, a fixed rack gear arranged within the tubular housing near one side thereof, a first gear arranged within the housing and engaging the fixed rack gear, a connecting rod for the crank and first gear, a movable rack gear slidably mounted within the housing near its side opposite the fixed rack gear shiftable longitudinally in said housing and engaging the first gear, a second gear secured to the movable rack gear near its lower end and engaging the fixed rack gear, said second gear being larger than said first gear, a second movable rack gear slidably mounted within the housing between the first named movable rack gear and the side of the housing opposite from the fixed rack gear and engaging the second gear, a rod connecting the second movable rack gear and pump handle, and means to rotate the crank.

JAMES A. MITCHELL.

REFERENCES CITED Theiollowing references are of record in the file of. this patent:

UNITED STATES PATENTS Number Name Date 1,865,290 Vaughn June 28, 1932 2,432,735 Downing Dec. 16, 1947 FOREIGN PATENTS Number Country Date 1,076 Great Britain of 1871 

